'm seriously considering upgrading to the Galaxy 8 and have questions.#1 - If I don’t like it, can I go back to my old phone and plan?#2 - I believe I have to install the SIM card and the extra memory myself, which is fine; will the SIM card already be configured for my new phone for Republic Wireless upon arrival?#3 - It says it comes with a mini USB charger; is that a wall outlet charger and/or a USB connection for my laptop or both?#4 - I have a SIM card in my current phone; I’m assuming that since the Galaxy 8 comes with a SIM card I will not need to use my old SIM card, is that correct?
Thank you!

For what it’s worth, my interpretation is he will get a USB data cable for plugging into a computer. He will also get a wall adapter that the USB cable may be plugged into. This is common practice for high end phones sold by Samsung. This would seem to be confirmed by Samsung here: https://www.samsung.com/us/support/answer/ANS00062591.

USB-C is the emerging standard for charging and transferring data. Right now, it’s included in devices like the newest laptops, phones, and tablets and—given time—it’ll spread to pretty much everything that currently uses the older, larger USB...

As the proud owner of an S8, it comes with a wall charger, that has a separate cable. The cable that is included is USB-A at one end and USB-C at the other. The phone also came with a USB-C to Micro-USB converter. The phone itself is USB-C.

this is one will go with a USB (Micro or type C ) I’m not sure which one that should come with the S8 (I believe Type C)

also from the tech page of the S8 Galaxy S8

I answered that above when i said: “it comes with a wall charger that has a separate cable”. That’s the 10W charger. I then further answered it when I said: “The cable that is included is USB-A at one end and USB-C at the other.” Which necessarily means that the wall adapter has a USB-A port, since the phone has a USB-C port.